Bug#1144855: libnet-oauth-perl: CVE-2026-75589

[Salvatore Bonaccorso]

Source: libnet-oauth-perl
Version: 0.32-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for libnet-oauth-perl.

CVE-2026-75589[0]:
| Net::OAuth versions before 0.33 for Perl check HMAC-SHA1, HMAC-
| SHA256 and PLAINTEXT signatures with a non-constant-time comparison
| in verify.  Each of the three compares the signature carried in the
| message against the locally computed one with the eq operator, which
| returns as soon as the two strings differ. The time taken to reject
| a signature varies with the length of the matching prefix. RSA-SHA1
| is not affected, as it verifies through the RSA key object rather
| than by comparing strings.  A client that can submit messages and
| time the replies may recover a valid signature one byte at a time
| rather than searching the whole signature space. Under PLAINTEXT the
| value compared against is the signature key itself, so the search
| recovers consumer_secret and token_secret.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-75589
    https://www.cve.org/CVERecord?id=CVE-2026-75589
[1] https://lists.security.metacpan.org/cve-announce/msg/42818763/
[2] https://github.com/vurtdev/Net-OAuth/security/advisories/GHSA-g8xr-69p3-gw56
[3] https://github.com/vurtdev/Net-OAuth/commit/a1a16b58add85668ef4fcda642a486ceed098eba

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore